1. Adams, I. (2001). Political Ideology Today. Manchester University Press.
2. Barry, J. (1999). Rethinking Green Politics: Nature, Virtue and Progress. Sage.
3. Barry, J., & Dobson, A. (2004). Green Political Theory: Report. In G. F. Gerald & K. Chandran (Eds.), Handbook of Political Theory. Sage.
4. Blühdorn, I. (2000). Post-Ecologist Politics. Routledge.
5. Bomnerg, E. (2005). Green Parties and Politics in the European Union. Routledge.